ΔE 11.8, fair: the same colour family, but not a straight swap. Mana Regeneration is a little lighter, cooler than Talassar Blue.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Mana Regeneration is a little lighter, cooler than Talassar Blue.
The same difference applies the other way round: Talassar Blue is a little darker, warmer.
ΔE is the colour difference between our two swatch estimates: under about 6 is close, over about 15 is loose. Real paints also differ in finish, coverage and how they thin, so test before you commit.
See Talassar Blue on the colour wheel See Mana Regeneration on the colour wheel
All matches: Talassar Blue equivalents · Mana Regeneration equivalents